I guess its lack of PK which u provide to her.
Raise used dosage of bloom fertil. for 2-3 days to feed her during later flowering.
Overall looks not bad just complete her needs.
Seems like some leaves got some salty precipitate.
Hope ur not overwatering her. At this stage I would recommend daily 150-200ml of water (+nutri's, but not everyday feeding).
Avoid using bigger amounts because its easy to block oxygen access to roots
Bless